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प्रश्न
Define the term ‘resolving power of a telescope’.
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उत्तर १
The resolving power of an astronomical telescope is defined as the reciprocal of the smallest angular separation between two point objects whose images can just be resolved by the telescope.
R.P = `(1.22 lambda)/D`
उत्तर २
Resolving power is the ability of the telescope to distinguish clearly between two points whose angular separation is less than the smallest angle that the observer’s eye can resolve.
संबंधित प्रश्न
You are given the following three lenses. Which two lenses will you use as an eyepiece and as an objective to construct an astronomical telescope ? Give reason
| Lenses | Power (D) | Aperture (cm) |
| L1 | 3 | 8 |
| L2 | 6 | 1 |
| L3 | 10 | 1 |
Draw a labelled ray diagram of an astronomical telescope to show the image formation of a distant object. Write the main considerations required in selecting the objective and eyepiece lenses in order to have large magnifying power and high resolution of the telescope.
Draw a labeled ray diagram of a reflecting telescope. Mention its two advantages over the refracting telescope.
Draw a labelled ray diagram of an astronomical telescope in the near point adjustment position. A giant refracting telescope at an observatory has an objective lens of focal length 15 m and an eyepiece of focal length 1.0 cm. If this telescope is used to view the Moon, find the diameter of the image of the Moon formed by the objective lens. The diameter of the Moon is `3.48 xx 10^6`m, and the radius of the lunar orbit is `3.48 xx 10^8`m.
With the help of a ray diagram explain the working of a reflecting telescope.
An optical instrument that uses objective and eyepiece lenses to magnify distant terrestrial or celestial objects is called a:
In a telescope, the lens facing the object is called the:
Which of the following changes improves the resolving power of a telescope?
Which type of telescope uses two convex lenses, with a large objective and a small eyepiece?
Which type of telescope uses a converging lens as eyepiece and gives an inverted image?
